缩写键
已记录的来源状态与原始语言说明；缺少版本证据时明确标为未知。
来源快照记录 PostgreSQL 8.1–18 的变化节点；历史矩阵独立记录 7.4–18 的状态。两者均未记录 PostgreSQL 19 或 20 的支持状态，较新版本明确保留为未知。这些来源声明与运行测量相互独立。
性能
说明
缩写键优化可以大幅提升 PostgreSQL 中排序的性能，包括用于 CREATE INDEX 的排序。据报告，在某些情况下，文本列上的 CREATE INDEX 速度可以快整整一个数量级（3 倍是更典型的提升）。数值排序也支持此优化。
所选版本: PostgreSQL 18
不支持
比较版本
原始文档链接
相关来源快照条目 · 此关系来自原始来源；两组矩阵各自保留独立状态。
完整来源事实与出处
legacy · center · bbddd780205a9dee2d776c7209a91c14ced5a657dcb3e6cd36a4fddd6097fb70
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